1. | Frogs respire only through their skin and not through lungs. |
2. | Adult frogs use their lungs for respiration, but can also respire through their moist skin. |
3. | Frogs cannot respire through their skin; they rely solely on their lungs. |
4. | The respiration in frogs is identical to that in humans, relying entirely on pulmonary ventilation. |
1. | Located on the head, used for detecting light and shadow only. |
2. | Located on the thorax, used for complex visual processing. |
3. | Located on the head, used for detailed and panoramic vision. |
4. | Located on the abdomen, used primarily for movement detection. |
1. | The oviducts open directly into the coelom. |
2. | Females have a single ovary. |
3. | Eggs are fertilized internally. |
4. | Eggs are laid and fertilized externally in water. |
Column I | Column II | ||
A. | Tight junctions | i. | Allow passage of ions and small molecules between cells |
B. | Desmosomes | ii. | Prevent the passage of molecules between cells |
C. | Gap junctions | iii. | Provide mechanical strength |
1. | The skin of frogs is dry and scaly, providing protection against predators. |
2. | Frogs have a moist skin covered with mucous glands that helps in respiration and protection against bacterial infection. |
3. | The skin of frogs is adapted to absorb water directly, eliminating the need for drinking. |
4. | Frogs possess a thick, keratinized skin that aids in terrestrial survival during dry conditions. |
Assertion (A): | Frogs undergo summer sleep and winter sleep. |
Reason (R): | Frogs are endotherms. |
1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
3. | (A) is True but (R) is False. |
4. | (A) is False but (R) is True. |
1. | Males have a pair of anal styles, which females lack |
2. | Females have a more segmented abdomen than males |
3. | Males are generally larger than females |
4. | Females have a pair of cerci, which males lack |
I: | Collagen fibres are predominantly found in connective tissues and are important for providing tensile strength. |
II: | Nervous tissue is made up of neurons and neuroglia, where neurons are responsible for transmitting signals and neuroglia for blood clotting. |
III: | Cardiac muscle tissue is striated and involuntary, with cells connected by intercalated discs to facilitate synchronized contraction. |
IV: | Epithelial tissues are avascular but derive nutrients through diffusion from underlying connective tissues |